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AVRational

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sample_aspect_ratio
aspect ratio in JPEG JFIF is SAR not DAR !
removed nonsense SAR guessing code
various related cleanups
bugs?

Originally committed as revision 2403 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2003-10-20 20:23:46 +00:00
parent 9dad924e22
commit 5ff85f1d8b
20 changed files with 215 additions and 183 deletions
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26
libavcodec/common.c
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@@ -386,29 +386,3 @@ int64_t ff_gcd(int64_t a, int64_t b){
if(b) return ff_gcd(b, a%b);
else return a;
}
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max){
double best_diff=1E10, diff;
int best_denom=1, best_nom=1;
int nom, denom, gcd;
//brute force here, perhaps we should try continued fractions if we need large max ...
for(denom=1; denom<=max; denom++){
nom= (int)(f*denom + 0.5);
if(nom<=0 || nom>max) continue;
diff= ABS( f - (double)nom / (double)denom );
if(diff < best_diff){
best_diff= diff;
best_nom= nom;
best_denom= denom;
}
}
gcd= ff_gcd(best_nom, best_denom);
best_nom /= gcd;
best_denom /= gcd;
*nom_arg= best_nom;
*denom_arg= best_denom;
}